Writing DOMDocument to clob

Question

Maybe I've missed something obvious but I can't get the XML stuff to work.
I've got a table with CLOBs containing XML text. I would like to use a proc to alter the XML and store it in another CLOB.
So:
DECLARE
v_source CLOB;
v_document XMLType;
v_dom_doc dbms_xmldom.DOMDocument;
v_result CLOB;
myParser dbms_xmlparser.Parser;
BEGIN
v_result := EMPTY_CLOB();
SELECT content INTO v_source
FROM user_content WHERE id = 1;
myParser := dbms_xmlparser.newParser;
dbms_xmlparser.setValidationMode(myParser, FALSE);
dbms_xmlparser.parseClob(myParser, v_source);
v_dom_doc := dbms_xmlparser.getDocument(myParser);
dbms_xmldom.writeToClob(v_dom_doc, v_result);
commit;
END;
This fails like this:
ERROR at line 1:
ORA-00600: internal error code, arguments: [kghsccread1], [18805], [18804], [],
ORA-06512: at "XDB.DBMS_XMLDOM", line 3734
ORA-06512: at "XDB.DBMS_XMLDOM", line 3752
ORA-06512: at line 15
I can't see anything wrong with it.Can anyone give me a clue?
Thanks.
Nic Ferrier

Answer 1

The documents I'm using seem to fail erratically (I've put an example at the end of the post).
The parser seems to be broken as regards tabs at the beginning of a line, but it also seems to be broken in other ways.
I tried to parse the document below and it works as long as the <test> root element no longer wraps the <precedent> element. When you put the <test> element in the parser fails when there are TABs at the start of certain lines.
It makes me VERY unconfident about the PL/SQL parser.
Here's my example document (but the tabs are probably dropped):
<?xml version="1.0"?>
<test>
<precedent-intro>
<title>Drafting Guide</title>
<para-text>This is a lease for a lock-up shop within a modern shopping centre, which would be on standard terms. The landlord provides services to the shop and more widely for the visitors to the centre. The tenant pays a service charge which contributes to the cost of all the services. An unusual provision is the landlord&apos;s obligation to consult all the centre&apos;s tenants about the opening hours, services and advertising.</para-text>
<para-text>The lease provides that the landlord has no continuing liability after parting with its interest in the premises, but the landlord covenants not to assign its interest in part only of centre. Without an express provision about continuing liability, the landlord is only released by serving notice on the tenant. That gives the tenant the opportunity to apply to the court to object (<legis-cite type='statute' id='1033194357' locsrc='1033193166' title='Landlord and Tenant (Covenants) Act' date='1995' docid='a1995c30' dbid='master' validated='yes'>
<legis-name href='root'>Landlord and Tenant (Covenants) Act 1995</legis-name>
, <legis-ref href='s6'>ss. 6</legis-ref>
, <legis-ref href='s8'>8</legis-ref>
</legis-cite>
). However, if the landlord assigned its interest in part of the centre, it would no longer be liable on its covenants relating to that part. That could make the provisions about services unworkable. See <emphasis type='normal'>Leasehold Law</emphasis>
, para. 1.016.</para-text>
<para-text>The tenant is free to dispose of the lease, with consent which the landlord is not entitled to withhold unreasonably, but is not entitled to sub-let part only of the unit. This preserves the intended subdivision of the centre and then prevents the situation at the end of the lease where a sub-tenant of part only of the unit is entitled to a statutory renewal of the lease of that part, so that the landlord finds itself obliged to let a divided property to more than one tenant (<legis-cite type='statute' id='1033194394' locsrc='1033193101' title='Landlord and Tenant Act' date='1954' docid='a1954(2&amp;3Eliz2)c56' dbid='master' validated='yes'>
<legis-name href='root'>Landlord and Tenant Act 1954</legis-name>
, <legis-ref href='s23'>s. 23</legis-ref>
, <legis-ref href='sch6'>Sched. 6</legis-ref>
</legis-cite>
; although if the head tenant applies to renew the lease of part of the premises, he can be obliged to take a new lease of the whole: <emphasis type='normal'>ibid.</emphasis>
<legis-cite type='statute' id='1033200923' locsrc='1033193101' title='Landlord and Tenant Act' date='1954' docid='a1954(2&amp;3Eliz2)c56' dbid='master' validated='yes'>
<legis-ref href='s32(2)'>s. 32(2)</legis-ref>
</legis-cite>
). See <emphasis type='normal'>Leasehold Law</emphasis>
, paras 4.285, 5.047.</para-text>
<para-text>On an assignment of the lease, the landlord can require the assignor to enter into an authorised guarantee agreement so that he continues to have responsibility for the performance of the lease covenants until the lease is further assigned (<legis-cite type='statute' id='1033194441' locsrc='1033193166' title='Landlord and Tenant (Covenants) Act' date='1995' docid='a1995c30' dbid='master' validated='yes'>
<legis-name href='root'>Landlord and Tenant (Covenants) Act 1995</legis-name>
, <legis-ref href='s16'>s. 16</legis-ref>
</legis-cite>
). See <emphasis type='normal'>Leasehold Law</emphasis>
, para. 4.330.</para-text>
<para-text>The tenant covenants to keep the premises open for business during the centre&apos;s general opening hours. The landlord will not be able to obtain an order of specific performance to enforce this (<case-cite type='ukcase' id='1033194450' locsrc='new' party1='Cooperative Insurance Society Ltd' party2='Argyll Stores (Holdings) Ltd' reference='[1998] A.C. 1' validated='yes' dbid='master'>
<casename italic='1'>
<party1>Cooperative Insurance Society Ltd</party1>
v. <party2>Argyll Stores (Holdings) Ltd</party2>
</casename>
<case-ref>[1998] A.C. 1</case-ref>
</case-cite>
). See <emphasis type='normal'>Leasehold Law</emphasis>
, para. 7.013.</para-text>
<para-text>The rent review is on an upward only basis. See <emphasis type='normal'>Leasehold Law</emphasis>
, para. 4.049. Another type of rent review clause can be substituted. The tenant covenants to keep the details of any rent review confidential. Although this may be commercially important for the landlord, there might be difficulties in enforcing the covenant.</para-text>
<para-text>The form assumes that guarantor(s) will guarantee the performance of the tenant&apos;s obligations. It also gives the landlord the option to require that the guarantor(s) take a new lease for the remainder of the term if the landlord forfeits current one. This extends the normal liability of a guarantor which would end on forfeiture. Because the original tenant&apos;s liability ends on assignment, subject only to the effect of any authorised guarantee agreement, his guarantor&apos;s liability is similarly limited. The landlord&apos;s position is therefore strengthened by a clause allowing it to withhold consent to an assignment unless a suitable guarantor guarantees the assignee&apos;s covenants.</para-text>
<para-text>The landlord covenants to comply with the terms of the head lease, so far as the sub-lease does not place the obligations on the subtenant. This is important for the sub-tenant, because the sub-lease comes to an end if the head lease is forfeited, subject to a right of relief (<legis-cite type='statute' id='1033194476' locsrc='1033194171' title='Law of Property Act' date='1925' docid='a1925(15&amp;16Geo5)c20' dbid='master' validated='yes'>
<legis-name href='root'>Law of Property Act 1925</legis-name>
, <legis-ref href='s146(4)'>s. 146(4)</legis-ref>
</legis-cite>
). See <emphasis type='normal'>Leasehold Law</emphasis>
, para. 6.075.</para-text>
<para-text>Any dispute under the lease is to be referred to arbitration. See <emphasis type='normal'>Leasehold Law</emphasis>
, para. 7.133.</para-text>
</precedent-intro>
</test>