JPH10232868A - Document processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a document processor capable of efficiently managing a document by converting a document structure without inviting the omission of the document structure. SOLUTION: When this document processor 11 receives an SGML document provided with the document structure of DTD-A, a document conversion part 11e structure-converts the SGML document to the document form of DTD-B and stores it in a document storage part 11g while adding the element name of a context losing node for losing context information by the mapping of the element name as an attribute value. At the time of receiving the document request of the SGML document from a document preparation device 10a or 10b, a document inverse conversion part 11f restores the SGML document to the document structure of DTD-A by conversion based on the mapping of the element name and the attribute value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a processing unit for processing a document having a first document structure, and when a document having a second document structure is received, converts the document to the first document. The present invention relates to a document processing apparatus that converts a structure into a structure and processes the document after the structure conversion by using the processing unit, and particularly relates to a document processing apparatus that performs document structure conversion and document management efficiently without causing a lack of a document structure.

[0002]

2. Description of the Related Art Conventionally, an SGM that expresses a document content in a text format by excluding layout information and the like from document data.
L (Standard Generalized Markup Language) documents are known.

[0003] This SGML document has an SGML declaration that describes various standards such as the type of character code used in the document,
DTD that specifies the interrelationship of document elements, ie, document structure
(Document Type Definition) and a document instance indicating the content of the document.

When a document instance is created based on the DTD, a style is applied to the document instance in a document processing apparatus that handles an SGML document.

[0005] By the way, looking at the status of document processing apparatuses in recent years, not only document processing apparatuses that can handle all SGML documents but also document processing apparatuses that can support only a specific DTD are widely used.

For example, in the integrated document processing system "Akane" developed by Fuji Xerox, a document instance created based on the Akane-specific DTD is to be processed.

Therefore, in order to process a document instance having a document structure other than a preset DTD on a document processing apparatus which can support only a specific DTD,
Document structure conversion between DTDs is required.

For this reason, Japanese Patent Laid-Open Publication No. Hei 7-105216 discloses a document logical structure processing method configured to convert a certain document into another kind of logical structure document having a different logical structure from the document. I have.

[0009]

However, when the logical structure is converted using this conventional technique, a part of the logical structure held in the original document may be lost. The restored document cannot always be restored to the logical structure of the original document.

FIG. 5 is a diagram showing the concept of conventional logical structure conversion. Here, a case where DTD-A is converted into a logical structure of DTD-B is shown.

As shown in FIG. 1, the DTD-A
A DTD having a node of “sect1” under nodes of “preference” and “chapter”.
DTD-B has “nse0” under the “nseg0” node.
This is a DTD having a node of g1 ″.

When the DTD-A and the DTD-B are compared, the element names are different.
1 ”to“ nseg1 ”and“ prefac
e ”is mapped to“ nseg0 ”and“ chapte
Logical structure conversion for mapping “r” to “nseg0” is performed.

However, "sect1" is changed to "nseg1".
When mapping to “ch”, “preference” and “ch”
Since both “after” and “after” are mapped to “nseg0”, considering the case of returning from DTD-B to DTD-A, “nseg0” is changed to “preference” and “chas”.
It is not known which of the two items to be returned.

As described above, in the conventional document structure conversion technology, there is a case where the original document structure cannot be restored due to the loss of context information. You must manage your documents.

As a result, the document management becomes complicated and the same document must be stored in duplicate, so that a large-capacity storage unit for storing the document is required. How to prevent information loss is an important issue.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a document processing apparatus capable of performing document structure conversion without causing a loss of the document structure and thereby efficiently performing document management. I do.

[0017]

In order to achieve the above object, a first invention has a processing unit for processing a document having a first document structure, and receives a document having a second document structure. At this time, in the document processing apparatus for converting the structure of the document into the first document structure and processing the converted document using the processing unit, the second document structure is converted to the first document structure. Converting means for converting the structure of the document into the first document structure while adding context information missing at the time of conversion as attribute information to the structure-converted document; and adding the converting means to the structure-converted document. Based on the attribute information
Restoring means for restoring the document to the second document structure.

According to a second aspect of the present invention, the conversion means, if the plurality of element names of the second document structure correspond to the predetermined element names of the first document structure, the predetermined element name The element name before the structure conversion is added as attribute information to the document element having.

According to a third aspect of the present invention, when the document element of the document whose structure has been converted by the conversion means has attribute information, the restoring means includes an element name of the document element of the document whose attribute information has been restored. It is characterized by the following.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing the concept of document structure conversion of the document processing apparatus 11 used in the present embodiment. Note that, in the present embodiment, DTD-A is
The case of conversion to -B will be described.

As shown in FIG. 2, this document processing device 11
In this document, when converting a document structure, in order to avoid loss of context information due to mapping of element names, the context information is stored as an attribute value of a node.

Specifically, “preference” is changed to “ns”.
When mapping to “eg0”, an attribute value “preference” is added to the corresponding node, and “chapte” is assigned.
When mapping "r" to "nseg0", an attribute value "chapter" is assigned to the corresponding node.

That is, if the structural conversion is simply performed by mapping the element names, a node that loses the context information (hereinafter referred to as a “context loss node”) occurs. Therefore, the element name is held here as an attribute value. .

If the SGML document before the document structure conversion is required, the document structure is inversely converted based on the attribute values, thereby restoring the SGML document before the conversion.

As described above, the document processing apparatus 11 introduces the concept of attribute values for structure conversion so that the document structure can be smoothly converted and inversely converted.

Next, the configuration of the document processing apparatus 10 according to the present invention will be specifically described.

FIG. 1 is a diagram showing an entire configuration of a document processing system used in the present embodiment and a detailed configuration of a document processing apparatus 10.

As shown in FIG. 1, the document processing system includes document creation devices 10a and 10a for creating an SGML document.
0b and a document processing device 11 that processes the SGML documents created by these document creation devices are connected via a LAN 12.

The document creation apparatuses 10a and 10b are provided with a DTD
-A device that creates an SGML document based on A or DTD-B, and outputs the created SGML document to the document processing device 11 via the LAN 12.

The document creation devices 10a and 10b
Is the SGM having the original DTD for the document processing device 11.
An L document can also be requested. For example, when a DTD-A SGML document (hereinafter, referred to as “SGML document A”) is output to the document processing apparatus 11, the SGML document A
Can be requested from the document processing apparatus 11, and DT
When a SGML document of DB (hereinafter referred to as “SGML document B”) is output to the document processing apparatus 11, the SGML document is output.
The ML document B can be requested from the document processing apparatus 11.

The document processing device 11 is a processing device that processes only an SGML document having a DTD-B document structure.

For this reason, in the document processing apparatus 11, S
When the GML document A is received, the SGML document A is
After the structure conversion into the GML document B, the SGML document is processed with the DTD-B document structure.

However, this document processing device 11 is a LAN
All of the SGML documents received from the storage unit 12 are temporarily stored in the document storage unit 11g in a DTD-B document structure, and thereafter, the document processing and the return of the SGML document corresponding to the document request are performed whenever necessary.

At this time, when the SGML document A having the DTD-A document structure is requested from the document creation device 10a or 10b, the corresponding SGM is stored in the document storage unit 11g.
Since only the L document B exists, the SGML document A is returned after the SGML document B is converted into the SGML document A.

Since the SGML document B corresponding to the requested SGML document A originally has a document structure corresponding to the DTD-A, the original document structure of the DTD-A is converted to the original DTD-A using the document inversion unit 11f. Perform the inverse transformation.

As described above, this document processing device 11
SGML document A having the document structure of TD-A is converted to DTD-B
And a function to convert the SGML document B after the structure conversion back into the SGML document A again.

If context information is lost during the structural conversion, the reverse conversion of the SGML document cannot be performed. Therefore, the document processing apparatus 11 uses the element name of the context lost node as an attribute value after conversion. It is to be added to the corresponding node.

Next, a specific configuration of the document processing apparatus 11 will be described.

As shown in FIG. 1, this document processing device 11
Are an I / F unit 11a, a document processing unit 11b, and a display unit 1.
1c, an input unit 11d, a document conversion unit 11e, a document reverse conversion unit 11f, and a document storage unit 11g.

The I / F unit 11a communicates with the S
An interface unit that controls transmission and reception of GML documents.
Specifically, if the SGML document is received from the LAN 12, the SGML document is output to the document processing unit 11b. If the SGML document is received from the document processing unit 11b, the SGML document is transmitted to the destination document via the LAN 12. Send to creation device.

The document processing section 11b is a processing section for processing an SGML document having a DTD-B document structure, and specifically, performs style setting, display, editing, printing, and the like for the SGML document.

Further, the document processing section 11b has a DTD-
When an SGML document having the document structure of A is received, the document is converted into a processable DTD-B document structure using the document conversion unit 11e, and the converted SGML document is stored in the document storage unit 11g.

Further, when a document request from the document creation device 10a or 10b is received, the corresponding SGML document is retrieved from the document storage unit 11g, converted into the requested document structure, and then output to the I / F unit 11a. .

That is, if the document structure of the requested SGML document is DTD-B, the SGML document corresponding to this request is extracted from the document storage unit 11g and output to the I / F unit 11a as it is.

On the other hand, if the document structure of the requested SGML document is DTD-A, after extracting the SGML document having the DTD-B structure corresponding to this request from the document storage unit 11g, The document structure of the SGML document is inversely transformed into DTD-A using the document inverse transformation unit 11f,
Output to the I / F section 11a.

The display unit 11c has a function that the document processing unit 11b
The input device 11d is an input device including a keyboard, a mouse, and the like, and is a display device such as a display used when performing style application to the ML document, document editing, and the like.

The document conversion unit 11e converts the structure of the SGML document having the DTD-A document structure requested by the document processing unit 11b into the DTD-B document structure,
A processing unit that outputs the ML document to the document processing unit 11b.

More specifically, in the document conversion unit 11e,
In order to prevent the context information from being lost due to the mapping of the element name, a process of adding the element name of the context lost node as an attribute value of the converted corresponding node is performed.

For example, "preference" of DTD-A
And “chapter” are both “ns” of DTD-B.
In the case of “eg0”, the attribute value “preference” or “chapter” is added to the corresponding node when mapping the element name.

The document reverse conversion unit 11f includes a document processing unit 11b
Converts the SGML document having the DTD-B document structure requested by
A processing unit that outputs a GML document to the document processing unit 11b.

More specifically, in the document reverse conversion unit 11f, the element name is mapped as it is for a node having no attribute value, and a corresponding node is used for a node having an attribute value by using the attribute value. Mapping between nodes is performed.

For example, "nseg0" of DTD-B is
“Preference” and “chapte” of DTD-A
In the case of “r”, the original document structure is restored using the attribute value “preference” or “chapter”.

As described above, the document reverse conversion unit 11f performs the reverse conversion of the document structure using the attribute value added by the document conversion unit 11e.

The document storage section 11g is a storage section for storing only an SGML document having a DTD-B document structure, and does not store an SGML document having a DTD-A document structure.

By using the document processing apparatus 11 having the above configuration, SGML documents having different document structures can be processed or managed smoothly.

Next, the processing procedure of the document conversion unit 11e shown in FIG. 1 will be described.

FIG. 3 is a flowchart showing a processing procedure of the document conversion unit 11e shown in FIG.

As shown in FIG. 3, this document conversion unit 11e
First, for the variable i indicating the node number,
Initialization for substituting 1 'is performed (step 301).

Then, it is determined whether or not the i-th node is a context lost node (steps 302 to 303). If the i-th node is not a context lost node, the process proceeds to step 305; Is added as the attribute value of the converted node (step 304).

Then, after mapping the element name of the i-th node of DTD-A to the element name of the i-th node of DTD-B (step 305), the variable i is incremented (step 306).

This processing is repeated until there is no unprocessed node (step 307). When the processing of all the nodes is completed, the processing ends.

By performing the above series of processing, the element name of the context lost node can be added as the attribute value of the converted corresponding node.

Next, the processing procedure of the document reverse conversion unit 11f shown in FIG. 1 will be described.

FIG. 4 is a flowchart showing a processing procedure of the document reverse conversion unit 11f shown in FIG.

As shown in FIG. 4, the document reverse conversion unit 11
In f, first, initialization for substituting '1' into a variable i indicating a node number is performed (step 401).

Then, it is checked whether or not the i-th node has an attribute value (steps 402 to 403). If the i-th node does not have an attribute value, mapping is performed between element names (step 404). In this case, the attribute value is used as the element name of the converted node (step 405).

Thereafter, after incrementing the variable i (step 407), the processing of steps 402 to 407 is repeated until there is no unprocessed node (step 40).
8).

By performing the above-described series of processing, reverse conversion of the document structure using element names and attribute values can be performed.

As described above, in the present embodiment,
When the document processing device 11 has an SG having a DTD-A document structure
When the ML document is received, the document conversion unit 11e converts the structure of the SGML document into the DTD-B document format while adding, as an attribute value, the element name of the context lost node whose context information is lost by mapping the element name. Document storage unit 11
g from the document creation device 10a or 10b.
When a document request for an ML document is received, the document reverse conversion unit 11
Since f is configured to restore the SGML document to the DTD-A document structure by the mapping based on the element name and the attribute value, the following effects can be obtained.

1) It is possible to prevent the loss of context information due to the structure conversion of the SGML document.

2) The structure conversion and the inverse conversion of the SGML document can be smoothly performed.

3) SGML documents can be managed with a unified document structure.

4) The storage capacity for storing SGML documents can be reduced.

In the present embodiment, the case where the structure conversion between the two types of document structures, DTD-A and DTD-B, has been described, but the present invention is not limited to this. It is also possible to apply the above-described structure conversion between document structures.

[0076]

As described in detail above, the present invention provides
While adding context information missing when converting the second document structure to the first document structure as attribute information to the structure-converted document, the document is converted to the first document structure, and the structure conversion is performed. Since the document is restored to the second document structure based on the attribute information added to the extracted document, the following effects can be obtained.

1) It is possible to prevent the context information from being lost due to the structure conversion of the SGML document.

2) The structure conversion and the inverse conversion of the SGML document can be smoothly performed.

3) SGML documents can be managed with a unified document structure.

4) The storage capacity for storing SGML documents can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire configuration of a document processing system used in an embodiment and a detailed configuration of a document processing apparatus.

FIG. 2 is a view showing the concept of document structure conversion of the document processing apparatus shown in FIG. 1;

FIG. 3 is a flowchart showing a processing procedure of a document conversion unit shown in FIG. 1;

FIG. 4 is a flowchart showing a processing procedure of a document reverse conversion unit shown in FIG. 1;

FIG. 5 is a diagram showing the concept of conventional logical structure conversion.

[Explanation of symbols]

10a, 10b: Document creation device, 11: Document processing device, 11a: I / F unit, 11b: Document processing unit, 11
c: display unit, 11d: input unit, 11e: document conversion unit,
11f: Document reverse conversion unit, 11g: Document storage unit, 12
… LAN

Claims (3)

[Claims] A processing unit that processes a document having a first document structure, and when receiving a document having a second document structure, converts the structure of the document into the first document structure; In a document processing apparatus for processing a document after a structure conversion using the processing unit, the context information missing when converting the second document structure into the first document structure is converted into attribute information in the document after the structure conversion. Converting means for converting the structure of the document into the first document structure, and converting the document into the second document structure based on attribute information added to the document whose structure has been converted by the converting means. A document processing apparatus comprising: a restoration unit for restoring. 2. If the plurality of element names of the second document structure correspond to predetermined element names of the first document structure, the conversion unit may convert a plurality of element names of the second document structure into document elements having the predetermined element name. 2. The document processing apparatus according to claim 1, wherein the element name before the structure conversion is added as attribute information. 3. The method according to claim 1, wherein, when the document element of the document whose structure has been converted by the conversion means has attribute information, the restoring means uses the attribute information as an element name of the document element of the restored document. 3. The document processing apparatus according to claim 2, wherein